Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Table Text Block [Abstract]

Share-Based Compensation Cost Table

millions		2012		2011		2010
Equity-Classified Awards
	Restricted stock	$	103	$	80	$	103
	Stock options		43		51		45
	Performance-based share awards and other		1		1		3
Total equity-classified award compensation expense			147		132		151
Liability-Classified Awards
	Value creation plan		(2)		26		—
	Performance-based unit awards		8		28		36
	Other performance-based awards		165		28		8
	Other		2		1		2
Total liability-classified award compensation expense			173		83		46
Pretax compensation expense		$	320	$	215	$	197
Income tax benefit		$	117	$	78	$	72

Restricted Stock Activity Table

		Weighted-
		Average
		Grant-Date
	Shares	Fair Value
	(millions)	(per share)
Non-vested at January 1, 2012	2.47	$	69.55
Granted	1.75	$	79.97
Vested	(1.33)	$	62.11
Forfeited	(0.07)	$	79.35
Non-vested at December 31, 2012	2.82	$	79.27

Stock Option Valuation Assumptions Table

	2012		2011		2010
Expected option life—years	4.9		4.8		4.9
Volatility	44.2	%	42.0	%	43.9	%
Risk-free interest rate	0.7	%	1.5	%	2.0	%
Dividend yield	0.5	%	0.5	%	0.7	%

Stock Option Activity Table

				Weighted-
		Weighted-		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Shares	Price		Term	Value
	(millions)	(per share)		(years)	(millions)
Outstanding at January 1, 2012	9.87	$	55.27
Granted	0.88	$	70.33
Exercised	(1.31)	$	40.04
Forfeited or expired	(0.08)	$	72.23
Outstanding at December 31, 2012	9.36	$	58.66	3.92	$	158.6
Vested or expected to vest at December 31, 2012	9.26	$	58.50	3.90	$	158.3
Exercisable at December 31, 2012	6.78	$	52.59	3.26	$	151.4